Drainage rack support



FIG. 1: Front top perspective view in use;

FIG. 2: Front top perspective view;

FIG. 3: Side elevation;

FIG. 4: Front elevation;

FIG. 5: Rear elevation;

FIG. 6: Top plan view; and,

FIG. 7: Bottom plan view.

The broken lines shown in the drawings represent portions of the environment that form no part of the claimed design. 

CLAIM The ornamental design for a drainage rack support, as shown and described. 